Question

the presence of some homologous structures in vertebrates suggests that these vertebrates: a. all develop at the same rate b. may have a common ancestor c. evolved from different animals that appeared on earth at the same time d. all develop internally and rely on nutrients supplied by the mother

Explanation:

Homologous structures are anatomical features in different organisms that have a similar underlying structure, indicating a common evolutionary origin. They do not imply the same development rate (A is wrong as different vertebrates develop at different rates), nor do they suggest evolution from different animals at the same time (C is wrong). Not all vertebrates develop internally with maternal nutrient supply (e.g., many fish and reptiles lay eggs, so D is wrong). The presence of homologous structures is a key piece of evidence for a common ancestor in evolutionary biology.

Answer:

B. may have a common ancestor